Pulverizing-mill.



5 0 9 0W 1 T P E S D E T N E T A P S A S L E l H T PULVERIZING MILL.

APPLIOATION FILED JUNE 22 1904 a SHEETS-SHEET 2.

3 wua m foz 7&4. 2

@Hoiuma No. 800,089. TEMED SEPT. 19,1905.

' V 'J. H. ELSPASS.

PULVBRIZING MILL" APPLIOATION IIILIED JUNE 22 1964.,

3 SHEETS-SHEET 3.

, 1 UNITED STATES PATENT OFFICE.

JOHN H. ELSP ASS, OF DENVER, COLORADO, ASSIGNOR TO THE ELSPA SS ROLLER QUARTZ MILL AND MANUFAOTURING COMPANY, OF PUEBLO, ooLoRAno. v

' PULVERIZI NG-MILL.

N 0. 800,089 Specification of Letters Patent. Patented Sept. 19, 1905,

Application filed June 22,1904. Serial No. 213,740.

' To all whom it may concern:

Be it known that I, JOHN H. ELSPASS, a citizen of the United States, residing in the city and county of Denver, and State of Colorado, have invented certain new and useful Improvements in Pulverizing-Mills; 'andI do declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference according to the fineness to which it is des1red to reduce the material under treatment. Hence this invention belongs to the same class as my previous patent,'No. 651.798,dated June 12, 1900, and also the same class as the inventions covered by my simultaneously-pending applications, serially numbered 141,075 and 205,211, respectively, and filed January 29, 1903, and April 27, 1904, respectively. My present invention relates to certain novel features of construction, relating both to the apparatus as a whole and to details of its construction, which may be considered improvements on the construction set forth in the previous patent and applications, all of which will now be described in detail, reference being made to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings,-Figure 1 is a central vertical section taken through my improved pulverizing-mill. This section may be said to be taken on the line 1 1, Fig. 2, parts, however,

' horizontal section taken on the level of the View of the plow forming a part of the mechanism. Fig. 6 is a similar view of a scraper Fig. 3 is a fragmentary sectional view also forming a part of the mechanism. Fig. 7 is a top view of the plow and the supporting part of the framework. Fig. 8 is afront View of the plow with the supporting framepiece shown in section, the mortar being indicated by dotted lines. Fig. 9 is a top view of a washer used in fastening the plow to its frame-supporting part. Fig. 10 is a horizontal section taken through one ofthe outer posts looking downwardly on the plow-supporting frame-bars.

The same reference characters indicate the same parts in all the views.

Let A designate the bed-plate of the apparatus, upon which are mounted a number or a series of inner posts B and a number of outer posts O. Between these. two series of posts is located an annular rotary mortar D, having a gear E fast on its lower surface and with which meshes a driving-gear F, fast on an operating-shaft G, journaled in suitable boxes G. Upon this shaft are mounted fast and loose pulleys H. The mortar is supported by frusto-c'onical rollers I, fast on shafts I, journaled in boxes I The shafts I are slightly inclined from their outer extremitiesdownwardly, and the inner end of the inner journal-box is closed,.as shown atI to prevent.

the escape of the lubricating material which is introduced at the outer extremityof the shaft. The bottom of the mortar which engages the supporting-rollers I is beveled to correspond with the beveled faces of the frust o-conical rollers, whereby there is a perfect rolling contact between the mortar and the supporting-gears during the operation of the machine. The upper surface of the mortar isprovided with ahardened-steel ring D, whose upper surface forms the pulverizing-face of the mortar. Outside of this ring the mortar is provided with a vertical offset D between which and the ring is placed a downwardly from a point D 'to a discharge- 1 chute D, where the pulverized material in the form of pulp escapes. This trough 1) consists of an outer wall 1), whose upper edge is nearly as high as the top of the mesh portion of the screen, while its lower edge extends below the screen. The inner wall D extends downwardly "from the lower surface of the ledge to the bottom D of the trough. This trough is therefore constructed to prevent any of the material which passes thereto from the mortar from escaping except by the regular outlet or discharge-chute D". The mortar is also provided with an inner wall D which rises from the bottom of the mortar vertically to the height of the ring D and is thence inclined inwardly, increasing the width of the mortar on the inside, thereby making room for the lower extremities of the conduits J, leading from the centrally-located hopper K, mounted on the upper part of the framework within the space surrounded by the inner series of posts B. The hopper K is provided with flanges K, which rest upon the top of the frame.

The postsUareinwardly inclined from their lower extremities upwardly, as shown at C, to a point C from which point they extend upwardly vertically, as shown at C. The inner posts B also have lower inclined portions B parallel or approximately parallel with the portions C of the outer posts. From a point B the inner posts extend vertically upwardly, as shown at 13 By virtue of the inclined portion C of the outer series of posts the mill is securely braced and room is made between the mortar and the posts for the trough D while the inclined portions B of the inner posts also have a tendency to brace the structure and give it great stability. The vertical positions of the upper portions of these posts are also preferred as a support for the roller axles. The upper vertical portions of both series of posts are bifurcated to receive boxes L and L, in which the extremities of the rolleraxles L are journaled. Above these axles and bearing on the boxes are the coil-springs L whose upper extremities are engaged by cross-heads or hearing plates L", which are engaged by tension-screws L, threaded in the top of the frame, whereby the tension of the springs may be regulated at will. Upon these shafts L are mounted and made fast the pulverizing-rolls lWLeach consisting of a body part M, a detachable part M and a hardened-steel tire M The part M where it engages the axle is provided with an inwardly-projecting collar M, which is surrounded by the part M the latter being secured to the body part M by screws M The parts M and M at their peripheries are inclined downwardly from their flat or vertical faces, making the outer periphery of the rollerlowest at its center. The adjacent face of the tire N 3 is beveled to fit the outer periphery of the roller, so that when the bolts M are applied to hold the part M in place the tire is locked in position. To remove the tire, it is only necessary to remove the screws M after which the tire may be easily removed by striking it on the out side, whereby it, together with the part M of the roll, is driven inwardly. This is an important feature, since it is necessary to change these ti res quite frequently, owing to the great wear to which they are subjected during the operation of the mill. The shaft lj is provided with an outer collar L, which bears against an inner flange formed on the journal-box L. The axle is also provided with an offset L against which the body of the roller bears, whereby the latter is prevented from moving outwardly on the shaft. The inner extremity of the shaft is also provided with an offset L, which bears against the inner box L. The shaft is thus locked against shifting in either direction, while the roll, which is connected with the shaft to rotate therewith, is prevented from sliding outwardly thereon. \Vhen the machine is in operation, the rolls bear upon the upper surface of the ring D, and the pressure is regulated by the tension of the springs L.

The inner posts B, as shown in the drawings, are cast integral with a ring N, which engages a ring 0, connected with the mortar, whereby the latter is accuratelycentered during the operation of the mill. The outer portion of the ring 0 is secured to the mortar by bolts O, while bolts 0" a re used to secure the ring 0 to the. brackets 0. To the top of the ring N outside of the posts is secured a plate Q, which overlaps the ring and forms a guard to prevent dust or foreign gmrlicles of matter from passing between the engaging or adjacent inclined faces of the two rings.

Mounted upon the bars R, which are secured to the outer series of posts above the top of the mortar, is a number of plows h, each of which is provided with a body part S and two projections S and S". The part S projects horizontally above the ledge l)", whereby the coarse material not pulverized to the desired fineness is carried outwardly to the pulverizing-face of the mortar, while the projection S extends inwardly over the pul veriZing-face of the mortar and has a lendency to carry any material in its path inwardly toward the center of the pulverizingface or in position for the rolls to act most effectively thereon. Above the arm 8' the body S of the device is provided with a curved face S", which also occupies a position above the ledge D and forces the pulp outwardly against the screen as the mortar rotates, whereby the pulverized material is made to pass through the screen and into the surrounding trough D This plow occupies a diagonal position with reference to the ledge and the pulverizing-face of the mortar, as shown in Figs. 2 and 7 of the drawings. Into the body of each plow is threaded a shank S which passes upwardly through a slot and the opening R of the washer is shaped to fit this shank, whereby the-plow is prevented from turning when its stem or shank engages the opening in the washer. The lug R is also grooved on its lower side, as shown at B .to recelve a nut R WlllCh also fits into the groove to prevent the nut from turning. The washer R and the nut R are applied to the shank of the plow before the latter, is inserted in a slot of the lug R. The shank is then inserted, in which event the nut and washer are locked against rotationon the lug. The shank is also looked against rotation by virtue of its flattened sides, which fit into the openings of the washer. A nut R is then screwed down upon the shank to engagement with the washer. In

this manner each plow is supported in oper-- ative relation with reference to the mortar.-

As shown in the drawings, there are four pulveriz-ing-rolls, the individual rolls of each pair being located on opposite sidesof the center of the mill. One of the plows S is located between each two rolls and in such a manneras not to interfere with the operation of the latter. From.the position of the plows in Fig. 2 of the drawings it will be understood that the mortar is rotated in the direction of the arrows in said View. In this event the operation of the plow as heretofore described will be readily understood-that is to say, the projection S will throw the coarse material from the ledge to the pulverizing-face of the mortar, While the curved face S will throw the pulp or the pulverized material mixed with water outwardly against the screen. At the same time the curved face of the projection S has a tendency to throw the material inwardly toward the center of the pulverizingface of themortar in order to bring it into proper position with reference to the rolls.

A number of scrapers T are also mounted on the frame-bars R and in suitable proximity to the screen, whereby as the mortar rotates the scrapers act to keep the screen clear on the inside. These scrapers consist of a body part T, having a'curved faceT which occupies a position above the ledge and quite close to the screen. The position of these scrapers is best illustrated in Fig. 2. The face or vertical surface T occupies a position next to the screen, while the point T extends in the direction opposite that in which the mortar is turning, whereby the curved or forwardlyprojecting face of the scraper has atendency to throw the pulp inwardly away from the screen for the purpose stated. Into the body part of the scraper is threaded a shank T to which is applied a lock-nut T. The upper part of the shank enters a slot formed in a lug R and; is secured by nuts T and. T which engage the lug R both above and below. The

arrangement for preventing the scraper from turning maybe substantially the same as that explained'in connection with the plow S, and therefore need not be further described in detail.

From the foregoing description the use and operation of my improved pulverizing-mill will be readily understood. Assumingthat the mill is set up and the springs L placed under proper tension, whereby the normal pressure of the rolls M on the pulverizingfaceofthe mortar is properly regulated, the driving-pulley H is connected with any suitable power, which is transmitted to the mortar through the instrumentality of the gears, as heretofore described. The material to be treated is then fed into the hopper K-and passes downwardly through the inclined conduits J into the inner portion of the mortar, whereby it is brought directly beneath'the pulverizing-rolls as the motar rotates. The coarser material, which works upwardly from the pulveriZing-face of the mortar to a position upon the ledge D is carried backwardly to the pulverizing-face of the mortar by the plow, while the concentrates or heavy metallic values settle upon the upper surface of the ledge D below the plow, which does not extend sufiiciently low to scrape off the concentrates. The relative position approximately of the. projection S of the plow with reference to the pulverizing-face of the mortar is illustrated in Fig. 8 of the drawings, in which the ledge D is indicated by dotted lines. As the material is pulverized it passes from the pulverizing-face of the mortar over the ledge and is thrown outwardly upon the screen, as heretofore explained. Attention is called to the fact that the material to be treated when fed into the hopper K is in the form of a pulp'that is to say, is mixed with a suitable quantity of water for pulverizing purposes.

The inner and outer series of posts are conneoted at the top by triangular frame members V, four of said members being employed, their inner extremities being connected with the inner series, of posts. by bolts V, while their outer extremities are connected with the outer posts by bolts V Each. of these members has .two arms V which extend outwardly from the center of the mill to an outer arm V.

The posts C are provided with bottom lugs with two lugs. (See Fig. 2 of the drawings.

The plow-supporting frame-bars R are connected with the outer posts by bolts R the posts being provided with lugs 0. (Shown in Fig. 9 and indicated by dotted lines in Fig. 10.)

The lower extremity of each conduit J is provided with a deflector J,,, consisting of a plate which is secured in the lower extremity O which are connected with the base A by means of bolts C Each post C is provided of the conduit and is bent downwardly in front of the open end of the conduit, whereby the material as it leaves the conduit is directed downwardly upon the pulverizing-face of the mortar.

Having thus described my invention, what I claim is 1. In a pulverizing-mill, the combination of inner and outer series of posts, each series of posts having inclined lower parts whose lower extremities are outermost, the upper portions of both series of posts being vertical and bifurcated, an annular rotary mortar located between the two series of posts, rollers supporting the mortar from below, pulverizing-rolls provided with axles journaled in boxes mounted in the bifurcated vertical portions of the inner and outer posts, tension-springs also located in the bifurcated portions of posts and engaging the boxes from above, and tension- I regulating means engaging the springs from above, the pulverizing-rolls cooperating with the mortar to perform the pulverizing function, substantially as described.

2. In a machine of the class described, the combination of inner and outer series of posts, the outer series of posts having inclined lower portions whose lower extremities are outermost, the upper portions of the posts being vertical, axles journaled in boxes engaging the inner and outer series of posts, the posts being open above the axle, coil-springs located in the openings of the posts, tension-regulating means located above the springs, pulveriZing-rolls mounted on the axles, and an annular rotary mortar located and suitably supported between the two series of posts, the mortar and pulverizing-rolls cooperating to perform the pulverizing function, substantially as described.

3. In a pulverizing-mill, the combination of inner and outer series of posts, the lower portions of the posts being inclined, their lower extremities being outermost, rolls having axles journaled in the inner and outer series of posts, an annular rotary mortar mounted be tween the two series of posts and cooperating with the pulverizing-rolls, roller-supports for the mortar, and a trough located between the mortar and the outer series of posts to receive the pulverized material from the mortar, the said trough having an inclined bottom, and an outlet leading from the lowest part of the bottom for the purpose set forth.

4:. The combination of inner and outer series of posts, the outer series of posts having inclined lower portions, theirupper portions being vertical, an annular rotary mortar located between the two series of posts and suitably supported, a trough surrounding the mortar and located between the latter and the outer series of posts, the outer wall of the trough being outwardly inclined from its upper periphery, the bottom of the trough being downwardly inclined to facilitate the discharge of the pulverized material therefrom, and pulverizing-rolls mounted on axles journaled in the inner and outer series of posts, the said rolls cooperating with the mortar to perform the pulverizing function, substantially as described.

5. In a pulverizing-mill, the combination with a suitable frame, of an annular rotary mortar suitably supported between inner and outer series of posts with which the frame is provided, a stationary feed-hopper centrally mounted on the upper part of the frame and occupying the space surrounded by the inner series of posts, the said hopper being provided with conduits leading downwardly and outwardly to the mortar, and mlverizing-rolls provided with axles journaled in the inner and outer posts and cooperating with the mortar to perform the pulverizing function.

6. In an apparatus of the class described, the combination with inner and outer series of posts, of an annular rotary mortar located between the two series of posts and provided with a pulverizing-face, and a ledge extending outwardly from said pulverizingface, pulverizing-rolls supported by the posts and cooperating with the pulverizing-face of the mortar, and plows mounted on the frame and occupying a diagonal position with reference to the pulverizing-face of the mortar and its ledge, each of the said plows having a projection extending outwardly over the ledge and presenting an inclined face to the material on the ledge as the mortar rotates, the inclination of the said face having a tendency to throw the material which comes in contact therewith, inwardly to the pulverizing-face of the mortar, the said plow having a part pro jecting inwardly over the pulverizing-face of the mortar and having a tendency to throw the material toward the center of said face, the plow beingfurther provided with a curved face located entirely above the first-named projection and curved to throw the pulp outwardly against the screen.

7. In a pulverizing-mill, the combination of a suitable frame having an inner series of posts, a rotary mortar surrounding the series of posts, and a stationary feed-hopper located in the central space surrounded by the posts and provided with supporting-flanges resting on top of the frame, the said hopper having conduits leading outwardly and douuiwardly to the mortar, substantially as described.

8. In a pulverizing-111i]l, the combination with inner and outer series of posts, an ammlar mortar located between the two series of posts, pulverizing-rolls mounted on the posts and cooperating with the mortar to perform the pulverizing function, a stationary feedhopper mounted on the frame and located within the central space surrounded by the inner series. of posts, and conduits leading outwardly and downwardly to the mortar, their lower extremities having vertical depending lips and being arranged to discharge into the mortar for the purposeset forth.

- 9. In a roller pulverizing-rnill, the combination with inner and outer series of posts, an annular rotary mortar located between the two series of posts, a ring mounted on the mortar, another ring mounted on the inner series of posts and cooperating with the mortar-ring to perform the mortar-centering function, and a horizontal platedetachably connected with the ring on the inner series of mortar mounted to rotate, the bottom of the posts-and projecting outwardly-over the ring on the mortar.

10. In a roller pulveriZing-mill, the combination with a suitable frame, of a circular mortar having an annular recess, a wall extending upwardly outside of the recess, a

ledge located above and extending beyond the pulverizing-face of the mortar, a screen surrounding the mortar beyond the ledge, av hardened-metal ring located in the recess in the bottom of the mortar, and a wood filling between the-ring and the upwardly-projecting wall, the inner circumference of the ledge being higher than the upper surface of the said ring.

11. In a pulverizing-mill, the combination of inner and outer series of posts, an annular rotary mortar located between the two series of posts, the said mortar having a bottom ring detachably connected with the mortar, an inwardly-inclined wall extending above the upper surface of the ring, an upwardlyprojecting wall beyond the outer periphery of the ring, a filling located between the ring and the upwardly-projecting outer wall, a ledgesurrounding the 'ringbeyond the lastnamed wall, the inner periphery of the ledge being abovethe upper surface of the ring, and a screen surrounding the mortar outside of the ledge.

12. In a-pulveriZing-mill, the. combination with a suitableframe,of an ann ular rotary mortar and plows mounted on the frame and occupying a position above the face of the mortar, each plow having a body part provided with a curved face on one side, and two projections extending'in opposite directions from the body part and located entirely below the curved face of the body part.

' In testimony whereof I aflEiX my signature in presence of two witnesses.

JOHN ELSPASS.

Witnesses:

DENA NELSON, A. J. OBRIEN. 

